Dump wagon hoist means



Sept. 1, 1959' B. l.. GoDBERsl-:N

DUMP WAGON HoIsT MEANS 2 sheets-sheet 1 Filed Dec. 8, 1954 w .i5 or, han@ nb .a vo n@ AL m M w T (a .2,

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Sept. 1, 1959 B. L. GODBERSEN DUMP WAGON HOIST MEANS Filed Dec. 8, 1954 2 Sheets-Sheet 2 ,imwnot' @von L, God bu'an mfg@ , A dlortigg United States Patent DUMP WAGON HOIST MEANS Byron L. Godbersen, Ida Grove, Iowa ApplicationDecember 8, 11954, Serial No. '473,852 3 Claims. (Cl. 298-22) This invention relates' to power hoists, is more particularly adapted for use in conjunction with wagon boxes, and is a continuation-impart of my United States 'Letters Patent, on a Hoist Mechanism for Dumping Vehicles, No. 26932199, issued December 28, 1954.

The application of a hoist or jack to one end of a wagon or truck body to facilitate unloading the contents thereof is, `of course, a common practice and with particular reference to wagon bodies which are not selfpropelled such hoists or jacks are generally a separate piece of apparatus used as the occasion demands. Consequently such hoists must be carried as additional equipment, and, of course, must be mounted for use on each occasion.

With these observations in mind it is the general aim of my invention to provide a hoist means for a wagon body that is mounted as a regular component of the body structure.

Another object of this invention is to provide a hoist of the above class that is foldable and retractible into a compact form when not in use so as to offer no interference with the normal use of the wagon body.

Still another `object of my invention is to provide a wagon mounted hoist which is always in position for use in dumping or spilling loads and which isv hydraulically operated with means for attachment to a source of hydraulic power on a tractor, truck or like. In this respect this hoist is a big timesaver as the hydraulic connection is all that need be done before the hoist is ready to use.

Still further objects of this invention is to provide a hoist mechanism for dumping vehicle boxes that is economical in manufacture, durable and strong in use and refined in appearance.

These and `other objects will be apparent to those skilled in the art.

My invention consists in the construction, arrangement, and combination of the various parts yof the device, whereby the objects contemplated are attained as hereinafter more fully set forth, specifically pointed out in my claims, and illustrated in the 'accompanying drawings, in which:

Fig. l is a perspective view of my hoist installed on a vehicle and with the vehicle 'box in elevated condition,

Fig. 2 `is an enlarged side sectional view of my device in a non-operable position,

Fig. 3 is a cross sectional View of the installed hoist taken on line 3-3 of Fig. 2 and more fully illustrates its construction,

Fig. 4 is ra top plan sectional view of the hoist and is taken on line 4-4 of Fig. 2, and K Fig. 5 isa side sectional view of my hoist showing the position of its elements in solid line lwhen the hoist is in a partially elevated position and with dotted lines showing the position of the elements of the hoist when the same is in expanded condition.

Referring to these drawings I have used the numeral to designate an ordinary wagon box mounted on a Patented Sept. 1, 1959 ICC wheel chassis 12. The forward portion of the chassis carries a bolster 14V and which is mounted transversely of the wheels. A similar bolster 16 is disposed at the rear of the chassis and between its two rear wheels. Each end of each bolster is provided with a vertically disposed stop andV abutment 18 and between these stops and on the respective holsters will rest portions of sides 20 and 22 of a frame mounted to the underside of the wagon box 10 as illustrated in Fig. l. Abutments 18 hold the body 10 against lateral movement with my hoist shown generally at 24, serving to limit forward movement as will later appear, and for the purpose of limiting a rearward movement of body 10 on the bolster 16 particularly when the wagon is tilted for dumping, I have provided on the rear portion of the respective sides 20 and 22 a depending bar 26 that engages the forward side of the bolster 16. By this means sides 20 and 22 in effect can rock on bolster 16 without sliding or slipping rearwardly.

Referring now to my new hoist 24 l have provided a rectangular frame member 28 pivotally mounted at one endV to bolster 14 so that its major axis is parallel to the major axis of chassis 12 and extends rearwardly from bolster 14. Stub shafts 36 project from each side of the forward end of frame 2S (Fig. 3) and are pivotally journaled in bearing members 32 which contain clamp means 34 for attachment to bolster 14. A hydraulic piston assembly 36 is mounted to frame 28 for pivotal movement therewith so that the plunger rod p0rtion 38 extends and retracts from the rearward side thereof and has the hose 39 for connection to a source of hydraulic power (not shown) in a manner well known in the art. A pair of like elongated lifting arms 40 and 42 are triangular in shape and are oppositely disposed at the rearward inner sides of frame 28 where they are pivotally attached to such frame by a pin 44 that connects with each arm 49 and 42 at one side of their wider or bottom end as shown in Fig. 5. The point of pivotal connection between arms 40 and 42 and the frame 28 is at one of the two base angles of the triangularlyshaped arms. A drum 45 is secured to the inner side of the arm 4l). A similar drum 46 is secured to the inner side of the arm 42. When the device is in folded condition these drums are spaced apart and are located sub stantially directly above the pin 44. The apex or narrow end of arms 40 and 42 are each pivotally connected between the respective pairs of ears 47 and 48 (Fig. 3) which depend from the center portion of an inverted U bracket 50 that is mounted to the frame sides 26 and 22 on the forward portion of the underside of wagon body 10 -as shown at 52 and 54 in Fig. 3. On the forward free end of the hydraulic piston rod 38 is an arcular head member 56 having a cable groove 58 in its periphery. This head 56 extends laterally of the wagon box and has a width that is greater than that of the distance between the two drums 45 and 46 as shown in Fig. 4. The piston rod 38 may operate in the space between the two drums. The drums 45 and 46 are not of perfect circles, but more inverted ovoids as shown in Fig. 2, the purpose of lwhich will be hereinafter appreciated. The numeral 6d) designates a flexible metal cable having one end secured by welding or like to the inner side of the arm 40 and its other endV secured in like manner to the inner side of the arm 42. The points of securing-ther cable 60is in the close vicinity ofthe pin 44' asshown iny Fig. 5. The cable loop thus formed has its two lengths riding over and around the two drums, respectively, as shown in Fig. 4. The center of the length of the cable rests in the groove 58 of the head 56. Keepers 62 keep the cable length in the groove 58.

Thus constructed and arranged, this hoist means will operate in the following manner. Fig. 3 illustrates the non-operating or retracted position of my hoist means with the wagon box level for purposes of transportation. To raise box l@ to position shown in Fig. 1, hose 39 is rst connected to a source of hydraulic power such as supplied by the tracto-r or prime mover and the hoist is ready for use since it is a regular part of the wagon construction and requires no setting or adjustment. As hydraulic pressure is applied, plunger rod 38 will move to the rear carrying with it the cable loop 60. Inasmuch as the two ends of the cable are fixed to the two arms 40 and 42 near the hinge pin 44, they will exert a forward and upward rolling action over the two drums, thereby causing the unit to move from a collapsed condition shown in Fig. 2, to an expanded condition shown in Fig. 1. Thus the extension movement of the unit will be motivated by the rear movement of the piston rod. However, the upending of the wagon box will not be in ratio to the movement of the piston rod, due later to the accelerated lever action movement of the opening of the jaws of the unit, but initially by the shape of the drums 45 and 46. By these drums being inverted ovoids, the piston will travel a relatively longer distance to start the load. This means additional initial power which is highly desirable when the box l is heavily loaded. Once, however, the load is started and in motion, less power is needed, and it is then desirable to speed up the lifting of the front end of the box 10. Obviously as the unit expands, the cable contacts the flatter planes of the drums,

a more direct connection is made, and the operation is v speeded up. With the wagon box in an elevated position its contents will spill from its rear end. The lowering is accomplished by progressively relieving the hydraulic pressure. Stops 70 may be on the outer sides of the arms 40 and 42 to limit the collapsing of the unit.

Some changes may be made in the construction and arrangement of my hoist without departing from the real spirit and purnose of my invention, and it is my intention to cover by my claims, any modified forms of structure or use of mechanical equivalents which may be reasonably included within their scope.

I claim:

1. A hoist, comprising, a rectangular frame having opposite sides and forward and rearward ends, said frame pivotally secured to the forward horizontal end portion of a horizontal wagon chassis, a hydraulic jack assembly pivotally attached at one end of the forward end of said frame, said jack assembly having a plungerV rod extensible rearwardly toward the rearward end of said frame, triangular-shaped elongated lifting arms inclined to a horizontal position with the lower of two base angle portions thereof pivotally connected to opposite sides of the rearward end of said frame, means for pivotally con necting the apex portion of each lifting arm to the forward underside of a wagon body which is pivotally secured on a horizontal axis to the rearward end of a wagon chassis to pivot upwardly in a vertical plane, said frame and said lifting arms being substantially the same length, said lifting arms being in a parallel horizontal position with said frame when not being operated, the other end of each of said lifting arms engaging the top forward end of said frame when said lifting arms are not being operated, a yoke formed by a cable movably secured to and passing over the plunger rod of said jack assembly and having the respective ends of said cable connected at opposite sides thereof to the lower of the two base angle portions of said lifting arms, an abutting means secured to said lifting arms above the point where said lifting arms are pivotally connected to said frame, said abutting means being positioned on said lifting arms so as to en- 4 gage the rearward side of said cable when said plunger rod under hydraulic pressure and bearing against said yoke moves said lifting arms and said frame upwardly about their respective points of pivotal connection; the pivotal axis between said frame and said chassis, between said jack assembly and said frame, between said lifting arms and said frame, between said lifting arms and said wagon body, and between said wagon body and said chassis, being in parallel directions.

2. In combination, a horizontal wheeled chassis, a wagon body pivoted at its rear end portion to the rear end portion of said wheeled chassis and movable between a lowered and a raised position, a frame having a forward and rearward end and hinged to the front end of said frame by its forward end, a horizontal lever member having its forward end hinged to the under area of the forward end of said wagon body and its other end pivoted to the rear end of said frame, a hydraulic jack assembly including a cylinder portion hinged to the forward end of said frame and a piston member having a free end extending rearwardly toward the rear end portion of said lever, a cable attached by its ends to the lowermost portion of the rear end portion of said lever member and connected to the free end of said piston member, and a drum on said lever positioned between the free end of said piston member and the ends of said cable with the length of said cable engaging and extending over said drum; the pivotal axis between said frame and said chassis, between said jack assembly and said frame, between said lifting arms and said frame, between said lifting arms and said wagon body, and between said wagon body and said chassis, being in parallel directions.

3. in combination, a horizontal wheeled chassis, a wagon body pivoted at its rear end portion to said wheeled chassis and movable between a lowered and a raised position, a frame having a forward and rearward end and hinged to the front end of said frame, a horizontal lever member having its forward end hinged to the under area of said wagon body and its other end pivoted to the rear end of said frame, a hydraulic jack assembly including a cylinder portion hinged to the forward end of said frame and a piston member having a free end extending rearwardly toward the rear end portion of said lever, a cable attached by its ends to the lowermost portion of the rear end portion of said lever member and connected to the free end of said piston member, and an ovoid-shaped drum on said lever positioned between the free end of said piston member and the ends of said cable with the length of said cable engaging and extending over said drinn; the pivotal axis between said frame and said chassis, between said jack assembly and said frame, between said lifting arms and said frame, between said lifting arms and said wagon body, and between said wagon body and said chassis, being in parallel directions.

References Cited in the file of this patent UNITED STATES PATENTS 1,482,335 Worthington Jan. 29, 1924 1,499,549 Ratigan July 1, 1924 1,508,846 Giles Sept. 16, 1924 1,628,907 Pennington May 17, 1927 1,813,278 Clark July 7, 1931 2,159,470 Cederstrom May 23, 1939 2,312,871 Brick Mar. 2, 1943 2,314,531 Wachter Mar. 23, 1943 2,332,961 Wood Oct. 26, 1943 2,588,489 Day Mar. 11, 1952 2,698,199 Godbersen Dec. 28, 1954 

